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• Higher parity correlates with subclinical left ventricular dysfunction detected by reduced global longitudinal strain (GLS) despite preserved ejection fraction.
• Each additional pregnancy leads to a measurable decline in myocardial strain independent of confounding factors.
• The association is stronger in older women and those with short interpregnancy intervals, indicating potential cumulative cardiovascular stress.
• GLS values remain within physiological pregnancy ranges, but the downward trend suggests long-term cardiac impact that requires further research.
